Mechanism for turning ships&#39; davits



A. WELIN.

MECHANISM FOR TURNING SHIPS DAVITS.

APPLICATION FILED JULY3, I914. I

Patented May 11, 1920'.

2 SHEETS-SHEET I.

A. WELIN.

MECHANISM FOR TURNING SHIPS DAVITS. APPLICATION FILED JULY 3. 1914.

1,389,532, Patented May 11, 1920.

UNITED STATES PATENT OFFICE.

AXEL WELIN, OF LONDON, ENGLAND, ASSIGNOR TO AMERICAN B'ALSA COMPANY,:INC., A CORPORATION OF NEW YORK.

MECHANISM FOR TURNING SHIPS DAVITS.

To all whom it may concern:

Be it known that I, AXEL WELIN, a subject of the King of Sweden, and aresident of London, England, have invented certain new and usefulImprovements in Mechanism for Turning Ships Davits, of which thefollowing is a specification.

The object of this invention is to provide improved means for turningships davits.

It is desirable that means for turning davits should. be of such anature that (1) they can be fitted to existing davits of the ordinarytype, (2) they can be arranged in any convenient place, close up to orremoved some distance from the davit, with as little alteration aspossible, (3) they can be fitted to existing davits of varying size withalteration of as few parts as possible, and (4) they shall beunafi'ected by bending of the davit under its load.

According to the present invention I secure to the davit a groovedcollar to one point of the circumference of which I fasten a wire rope.From this point the rope passes in both directions around the collar andthence over guide pulleys if necessary, to a drum or collar on thebottom of a vertical shaft which can be rotated preferably by a crankhandle and worm gear, toothed gearing being interposed if desired. Thedrum and the parts actuating it may all be carried by a pedestal whichcan be bolted to the deck at any convenient place so that the only thingthat is aifected by the distance of the actuating part from the davit isthe length of the rope.

I preferably secure the collar to a divided strap or bracket which canbe clamped to the davit. The collar is a complete ring with a centralorifice so large that it can be slipped onto the davit and thus one sizeof collar may be fitted to davits of various sizes.

It is advisable that the collar should be as near as possible to thebearing of the davit in order that the mechanism may be unaffected byany bending of the davit due to the load.

I may arrange for tightening the rope to take up stretch by forming aloop in the middle of the wire and passing this loop through a hole inthe collar into the interior Specification of Ietters Patent.

Patented May 11, 1920.

thereof and then making it fast to the davit so that by turning thecollar around. the davit the rope will be tightened.

In cases where the two davits turn in unison but in opposite directionsboth maybe turned by a single rope of which ends are secured to a singledrum. Or they may be turned by two ropes passing around two drums andgeared together by elliptic gears so that they can be operated from asingle shaft.

I may employ similar means to turn from a single spindle both davitseven when they do not turn in unison that is when the distance betweenthem is less than the length of the boat as is usually the case withdavits the twov of the old fashion. T o effect this I connect asdescribed above a collar on each davit to a drum or driving pulley by arope and I provide each drum with a segment of teeth the one segmentmeshes with a driving pinion and the other with an intermediate pinionwhich itself meshes with the driving pinion which is mounted on aspindle that can be rotated by any convenient means. The segments areconnected by a link or coupling and are so arranged that one only is inmesh at first; as the first segment turns the other is turned in. theopposite direction and then in the same direction owing to the action ofthe link; as the first segment comes out of mesh the second segmentcomes into mesh and the continued rotation of the spindle completes theturning out of the davits. In. place of coupling the segments, the headsof the davits may be coupled together.

The accompanying drawings illustrate my invention. 7

Figure 1 is an elevation showing means for turning a single davit. Fig.2 is a. plan to a larger scale of a collar, and Figs. 3 and 4 sectionsat right angles to one another of a collar and strap. Fig. 5 is a planshowing means for turning two davits in unison. Fig. 6 shows thearrangement. of elliptic gear. Fig. 7 is a plan of the arrangement forturning two davits which do not turn in unison, and Fig. 8 shows anarrangement of gear mechanism for turning out such davits.

a is a davit to which near its bearing 6 is secured a split strap 0 towhich is bolted a grooved collar cl. A loop in a rope e is y) 7' arefast with the two drums. The drums passed through a hole f in the collarand secured by a screw 9 to the strap. The rope is then passed in bothdirections around the collar and is then led to and fastened around adrum h on a shaft '5 carried by a pedestal j and having fast on it aworm wheel 70 meshing with a worm which can be turned by a handle Z. c

Fig. 5 shows a pair of davits driven to gether from a single pedestal.An endless rope passes from one davit around a drum h, to the otherdavit, around a second drum co axial with the first, and then back tothe first davit, so that by turning the handle the two davits areturned. out (or in) to gether at the same speed.

In Fig. 6 the spindle i is rotated in any convenient way, say by wormgear, or by means of an internal ring of teeth fast on it, and meshingwith a pinion rotated by a crank handle. The spindle has fast upon itone of the drums 7t and also an elliptic gear wlheel m meshing with anequal elliptic wheel a fast with the other drum. The gears are soarranged that at the beginning of the turning out movement the forwarddavit turns faster than the aft davit. That is,-the position of thegears, which is shown in the drawing, is their normal position with theboat in board.

This modification of my invention is especially suitable to cases inwhich the boat is carried on the davits with its bows somewhat nearerthe side of the ship than is its stern, and can be slung out with littleor no back movement of the aft davit.

In Figs. 7 and 8 the shaft 2' has on it a pinion 0 meshing with atoothed segment 1) and with it an intermediate pinion g which mesheswith a segment 9. Tie two segments and pinions are for the sake ofclearness shown to a larger scale than the davits and boat but inreality the drums are the same size as the collars on the davits. Thetwo segments are connected by a link 8. The segment 1 is fast with thedrum 7i connected to one davit a while the segment p has fast with i;adrum connected to the other davit u. On starting to turn out, thesegment 1" is in mesh with the pinion 1 and the'davit d is in fined outto thedottedpositions 1 and 2, the davit it being moved by the action ofthe link first into the position 1 and thence into position 2; justbefore the segment 1" comes out of mesh the segment 3) comes into meshwith pinion 0 and davit u is thus turned from position 2 to position 3,davit a moving back from position 2 to position 3. If desired the davitheads may be connected by a bar in which. case the link 8 may beomitted, the various movements taking place in the same order.

I claim 1. In combination, a pair of davits pivoted to rotate and havingan overhanging portion adapted together to support a boat, collar oneach davit, a flexible connection connected with each collar and havingparts extending on opposite sides thereof, and a common drivingmechanism for all the said parts for rotating said shaft in oppositedirections to swing the davits in opposite directions.

2. In combination, a pair of davits piv oted to rotate and havingoverhanging portions adapted together to support a boat, a collar oneach davit, a flexible connection secured to each collar and havingparts extending on opposite sides thereof, asingle actuating spindlesupported adjacent to said davits, and drum mechanism associated withsaid spindle at its lowerend and to which said opposite parts of theflexible connection are connected.

3. In combination, a pair of davits pivoted to rotate and havingoverhanging portions normally extending toward each other and arrangedto support a boat therebetween, the distance between the axis of thedavits being less than the length of the boat to be carried thereby, acollar on each davit, a

flexible connection secured to each collar and having parts extending onopposite sides thereof and a single driving mechanism to which the partsfrom both davits is connected adapted to cause the outboard movement ofone end of the boat first and then of the opposite end thereof.

4c. The combination with a pair of davits pivoted to rotate, of a collaron each davit, a pair of drums, flexible connections between saidcollars and drums, an actuating spindle, a driving pinion on saidspindle, an intermediate pinion meshing with said pinion, and a toothedsegment associated with each drum so arranged as to mesh the one withsaid driving pinion and the other with said intermediate pinion.

5. The combination with a pair of davits pivoted to rotate, of a collaron each davit. a pair of drums, flexible connections between saidcollars and drums, an actuating spindle, a driving pinion on saidspindle, an intermediate pinion meshing with said pinion, a toothedsegment associated with each drum so arranged as to mesh the one withsaid driving pinion and the other with said intermediate pinion, and alink pivotally connected to the two segments.

AXEL W ELIN.

Witnesses:

W. E. Roenns, O. J. l/VORTH.

